Fuel injection system

Abstract

A fuel injection system for internal combustion engines with multiple fuel injection valves. The fuel injection system includes a dimensionally stable fuel manifold distributor with nipple plug connections, by means of which the fuel is directed to the individual injection valves. The fuel manifold distributor is disposed over the injection valves and is pitched with respect to the horizontal, with a fuel injection connection located at the lowest point of said manifold and connected to the pressure side of a fuel pump, with a return line connection provided at the highest point of the fuel manifold distributor leading to a return flow line, over which a portion of the fuel may be redirected to a pressure regulator and from there to the suction side of a fuel tank to which the fuel pump is connected. The fuel manifold distributor design described here makes it possible for the vapor lock bubbles that are formed to enter the return flow line after the hot internal combustion engine has been switched off, and to be directed to the suction side of the fuel pump when said internal combustion engine is restarted, thus making it possible to avoid problems in starting.

What is claimed and desired to be secured by Letters Patent of the United States is: 
     
       1. A fuel injection system for internal combustion engines with multiple injection valves, comprising a common dimensionally stable fuel manifold distributor, said fuel manifold distributor being positioned above said injection valves and fitted with a return line connection, said return flow line redirecting fuel admitted to said manifold distributor through an input connection from a fuel pump connected to a fuel tank through a pressure regulator back to said fuel tank, said input connection of the fuel manifold distributor is disposed on the pressure side of the fuel pump and at the lowest point of said fuel manifold distributor, in which said fuel manifold distributor which distributes fuel to each of said multiple injection valves is on an angle with respect to the horizontal and connected to each of said injection valves via a nipple, said fuel manifold distributor has two sections joined at a central junction at an angle with respect to each other with the central junction of said sections disposed at a higher point than the ends of said fuel manifold distributor, and the connection to which said return flow line is connected is at said central junction which is the highest point of said fuel manifold distributor relative to horizontal. 
     
     
       2. A fuel injection system as claimed in claim 1 which includes a spill line connected between each of said injection valves with said spill line connected to said pressure regulator for cooling said valves and for preventing formation of vapor lock bubbles in said valves. 
     
     
       3. A fuel injection system as claimed in claim 1 which includes a spill line connected between each of said injection valves with said spill line connected to said pressure regulator for cooling said valves and for preventing formation of vapor lock bubbles in said valves.